ASP.NET Programming with C# and SQL Server - Chapter 3
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Questions and Answers

What determines the variable scope in a program?

  • The function name in which it is defined
  • The type of data stored in the variable
  • The programming language used
  • The location where the variable was declared (correct)

    • Which statement about local variables is true?

  • Local variables can be accessed globally
  • Local variables remain accessible after function execution
  • Local variables overwrite global variables of the same name permanently
  • Local variables cease to exist once the function ends (correct)

    • What is a global variable?

  • A variable only accessible within its own function
  • A variable that encapsulates multiple local variables
  • A variable declared within a code block and accessible globally (correct)
  • A variable that cannot be modified after declaration

    • How do you access an object property within a collection in the Request object?

    <p>object.collection(“property”)</p> Signup and view all the answers

    What is the role of the Request.Form collection?

    <p>To hold variables representing form elements submitted via POST</p> Signup and view all the answers

    What is considered poor programming practice regarding variable naming?

    <p>Using the same name for both local and global variables</p> Signup and view all the answers

    What is the purpose of the return statement in a function?

    <p>To return a value to the caller of the function</p> Signup and view all the answers

    Which is true when both a global and local variable share the same name?

    <p>The local variable takes precedence when called</p> Signup and view all the answers

    What does the Count property in the Request.QueryString collection return?

    <p>The number of variables in the collection</p> Signup and view all the answers

    What is the main purpose of an if statement in programming?

    <p>To make decisions based on conditional expressions</p> Signup and view all the answers

    In an if…else statement, how many sets of statements can be executed?

    <p>Only one set of statements will be executed based on the condition</p> Signup and view all the answers

    What is true about nested if statements?

    <p>They allow evaluation of multiple conditional expressions</p> Signup and view all the answers

    What does a switch statement compare?

    <p>The value of an expression with case label values</p> Signup and view all the answers

    What is the syntax for an if statement with a command block?

    <p>if (condition) { statements; }</p> Signup and view all the answers

    Which of the following is NOT true about an if statement?

    <p>It can have multiple else conditions attached</p> Signup and view all the answers

    In a switch statement, what is a case label?

    <p>A specific value to compare against the expression</p> Signup and view all the answers

    What is the primary purpose of a switch statement?

    <p>To evaluate a single expression and match it with multiple cases</p> Signup and view all the answers

    What will happen if a break statement is omitted from a switch case?

    <p>The control will fall through to subsequent case labels</p> Signup and view all the answers

    What condition must be met for a while statement to repeat its execution?

    <p>The conditional expression must evaluate to true</p> Signup and view all the answers

    Which of the following statements about the do...while loop is true?

    <p>It guarantees that the statements will be executed at least once</p> Signup and view all the answers

    What is an infinite loop?

    <p>A loop that never ends because its conditional expression remains true</p> Signup and view all the answers

    What is a counter in the context of loop statements?

    <p>A variable used to track the number of iterations in a loop</p> Signup and view all the answers

    Which structure allows for a condition to be evaluated after executing its block of statements?

    <p>do...while statement</p> Signup and view all the answers

    What can cause a while statement to not execute at all?

    <p>The conditional expression is initially false</p> Signup and view all the answers

    What is the purpose of a function in C#?

    <p>To organize a related group of statements as a single unit</p> Signup and view all the answers

    What does the 'void' keyword indicate in a function definition?

    <p>The function will return no value</p> Signup and view all the answers

    Which part of a function definition specifies its intended output type?

    <p>Return data type</p> Signup and view all the answers

    In the context of functions, what is a parameter?

    <p>A variable used within a function defined in its parentheses</p> Signup and view all the answers

    Which statement is correct about calling a function?

    <p>Arguments are values assigned to function parameters during the call</p> Signup and view all the answers

    What is needed before a function can be used in C#?

    <p>It must be defined</p> Signup and view all the answers

    Which of the following best describes a code declaration block?

    <p>It contains functions and global variables</p> Signup and view all the answers

    What is the correct syntax to define a function in C#?

    <p>returnDataType functionName(parameters) { return statements; }</p> Signup and view all the answers

    What is the primary purpose of a for statement in programming?

    <p>To execute a block of code a specific number of times</p> Signup and view all the answers

    How does the counter variable in a for statement behave during its execution?

    <p>It is updated automatically with each iteration</p> Signup and view all the answers

    What effect does the continue statement have within a loop?

    <p>It stops the current iteration but continues with the next one</p> Signup and view all the answers

    What defines a local variable in programming?

    <p>A variable that is declared within a function or code block</p> Signup and view all the answers

    Which statement accurately describes the flow control in programming?

    <p>Flow control dictates the order in which statements execute</p> Signup and view all the answers

    What is the difference between global and local variables?

    <p>Local variables are declared inside a function, while global variables are outside</p> Signup and view all the answers

    Which scenario best illustrates when to use a do…while loop?

    <p>When at least one execution of the loop must occur, regardless of the condition</p> Signup and view all the answers

    In decision-making structures, what does nesting allow?

    <p>Executing an if statement within another if statement</p> Signup and view all the answers

    Study Notes

    ASP.NET Programming with C# and SQL Server - Chapter 3 Summary

    • Chapter 3 covers using functions, methods, and control structures in ASP.NET programming with C# and SQL Server.
    • Objectives include learning to use functions to organize C# code, working with the Request object, using if, if...else, and switch statements for decision-making, and using while, do...while, and for statements for repeated code execution.
    • Functions group programming statements into logical units. They are procedures used to organize related C# statements.
    • Code declaration blocks contain ASP.NET functions and global variables. The <script> element defines a code declaration block, specifying the scripting language (e.g., C#) and execution environment (e.g., server-side).

    Defining Functions

    • Define a function before using it.
    • Function definition contains the lines of code that make up a function.
    • Syntax: returnDataType functionName(parameters) { statements; }.
    • Return data type indicates the output type. void means the function doesn't return a value.
    • Parameters are variables used within a function. They are placed inside the parentheses of the function definition, with each parameter's data type declared.

    Calling Functions

    • Function definition alone does not execute the function.
    • Calling a function invokes or executes it.
    • Function call is the code that invokes a function.
    • Syntax: functionName(argument1, argument2, ...);.
    • Arguments are the values passed as input to a function in the function call. Arguments are also called actual parameters. They are assigned to the function parameters.

    Returning Values

    • A function may return a value.
    • Returned value can be assigned to a variable.
    • Syntax: variable = functionName(parameters);
    • A return statement in a function sends a value back to the code that called it.
    • Syntax: return variable;

    Understanding Variable Scope

    • Scope defines where a variable can be accessed. It is determined by where the variable is declared.
      • Global variables are declared outside of functions within a code declaration block and are available throughout the entire page.
      • Local variables are declared inside functions or code blocks and are only available within that function or code block.

    Working with the Request Object

    • The Request object is a built-in ASP.NET object representing a client's URL request.
    • The Request object uses collections to store object properties
    • Syntax: to access an object collection: object.collection("property")
    • Form collection contains variables representing form elements from a web page.
    • Example: Request.Form["name"]
    • There are many request collections (e.g., cookies, query string, server variables, clients certificates). Each contains specific data.

    Making Decision

    • Decision-making (or flow control) determines the order in which statements execute in a program.
    • The if statement is the most common decision-making statement.
    • The if statement executes statements when a conditional expression is true

    if...else Statements

    • An if...else statement executes one set of statements when a conditional expression is true and another when it's false.
    • One, and only one, set of statements will be executed.

    Nested if and if...else Statements

    • A nested decision-making structure has one decision-making structure contained within another.

    switch Statements

    • A switch statement executes a specific set of statements depending on the value of an expression.
    • A matching case label activates the corresponding block of statements.
    • Provides an alternative to a series of nested if...else statements when multiple conditional checks are needed.

    Repeating Code (Loop Statements)

    • Loop statements repeatedly execute a block of statements.
    • Types include while, do...while, and for.
      • while: repeats statements as long as a conditional expression evaluates to true.
      • do...while: executes statements once and then repeats as long as the conditional expression is true.
      • for: used for repeating a block of code, often with a counter variable that increments or decrements with each iteration.

    Using continue Statements

    • A continue statement skips the remaining statements within the current loop iteration, but allows the loop to proceed with a new iteration.

    Summary

    • Key components like <script> blocks, functions, scopes (global and local), the Request object, decisions (if/else, switch), and loops (while, do...while, for) are used to build dynamic web applications in ASP.NET C#.

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    ASP.NET Programming with C# and SQL Server PDF

    Description

    This quiz focuses on Chapter 3 of ASP.NET programming, emphasizing the use of functions, methods, and control structures in C#. Learn how to utilize the Request object and implement decision-making with if statements and loops for code execution. Test your understanding of organizing code and function definitions in ASP.NET.

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